Chemical Bonding and Molecular Structure

The number of sp² hybrid orbitals in a molecule of benzene is :

The bond dissociation energy of B - F in BF₃ is 646 kJ mol⁻¹ whereas that of C - F in CF₄ is 515 kj mol⁻¹. The correct reason for higher B - F bond dissociation energy as compared to that of C - F is

The correct order of bond angles (smallest first) in H₂S, NH₃, BF_3 and SiH₄ is

The bond angle H - X - H is the greatest in the compound :

Arrange the following bonds according to their average bond energies in descending order : C–Cl, C–Br, C–F, C–I

Given below are two statements : one is labeled as Assertion A and the other is labelled as Reason R : Assertion A : The H$-$O$-$H bond angle in water molecule is 104.5$^\circ$. Reason R : The lone pair - lone pair repulsion of electrons is higher than the bond pair - bond pair repulsion. In the light of the above statements, choose the correct answer from the options given below :

$\mathrm{O}-\mathrm{O}$ bond length in $\mathrm{H}_{2} \mathrm{O}_{2}$ is $\underline{\mathrm{X}}$ than the $\mathrm{O}-\mathrm{O}$ bond length in $\mathrm{F}_{2} \mathrm{O}_{2}$. The $\mathrm{O}-\mathrm{H}$ bond length in $\mathrm{H}_{2} \mathrm{O}_{2}$ is $\underline{Y}$ than that of the $\mathrm{O}-\mathrm{F}$ bond in $\mathrm{F}_{2} \mathrm{O}_{2}$. Choose the correct option for $\underline{X}$ and $\underline{Y}$ from those given below :

For $\mathrm{OF}_{2}$ molecule consider the following : A. Number of lone pairs on oxygen is 2 . B. FOF angle is less than $104.5^{\circ}$. C. Oxidation state of $\mathrm{O}$ is $-2$. D. Molecule is bent '$\mathrm{V}$' shaped. E. Molecular geometry is linear. correct options are:

The bond dissociation energy is highest for

Which of the following are isostructural pairs ? A. $SO_4^{2 - }$ and $CrO_4^{2 - }$ B. SiCl₄, and TiCl₄ C. NH₃ and NO₃⁻ D. BCl₃ and BrCl₃

Given below are two statements : Statement I : $\mathrm{SO}_{2}$ and $\mathrm{H}_{2} \mathrm{O}$ both possess V-shaped structure. Statement II : The bond angle of $\mathrm{SO}_{2}$ is less than that of $\mathrm{H}_{2} \mathrm{O}$. In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : There is a considerable increase in covalent radius from $\mathrm{N}$ to $\mathrm{P}$. However from As to Bi only a small increase in covalent radius is observed. Reason (R) : Covalent and ionic radii in a particular oxidation state increases down the group. In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following statements is true?

Which of the following compounds contain(s) no covalent bond(s)? KCl, PH₃, O₂, B₂H₆, H₂SO₄

The covalent alkaline earth metal halide (X = Cl, Br, I) is :

Arrange the following in increasing order of their covalent character. A. $\mathrm{CaF}_{2}$ B. $\mathrm{CaCl}_{2}$ C. $\mathrm{CaBr}_{2}$ D. $\mathrm{CaI}_{2}$ Choose the correct answer from the options given below.

Given below are two statements. Statement I: $\mathrm{O}_{2}, \mathrm{Cu}^{2+}$, and $\mathrm{Fe}^{3+}$ are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field. Statement II: $\mathrm{NaCl}$ and $\mathrm{H}_{2} \mathrm{O}$ are weakly magnetized in opposite direction to magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below.

Order of Covalent bond; $\mathrm{A.~KF > KI ; LiF > KF}$ $\mathrm{B.~KF < KI ; LiF > KF}$ $\mathrm{C.~SnCl_4 > SnCl_2 ; CuCl > NaCl}$ $\mathrm{D.~LiF > KF ; CuCl < NaCl}$ $\mathrm{E.~KF < KI ; CuCl > NaCl}$ Choose the correct answer from the options given below :